CN110152614A - A kind of preparation method of the modified iron-based mercury absorbent in surface - Google Patents
A kind of preparation method of the modified iron-based mercury absorbent in surface Download PDFInfo
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- CN110152614A CN110152614A CN201910383673.2A CN201910383673A CN110152614A CN 110152614 A CN110152614 A CN 110152614A CN 201910383673 A CN201910383673 A CN 201910383673A CN 110152614 A CN110152614 A CN 110152614A
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
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- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0274—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
- B01J20/0281—Sulfates of compounds other than those provided for in B01J20/045
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/045—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing sulfur, e.g. sulfates, thiosulfates, gypsum
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
- B01J20/106—Perlite
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/288—Treatment of water, waste water, or sewage by sorption using composite sorbents, e.g. coated, impregnated, multi-layered
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Abstract
The invention discloses a kind of preparation methods of the modified iron-based mercury absorbent in surface, comprising the following steps: (1) ferrous sulfate is soluble in water with ferric sulfate, sealing stirring obtains Fe-base Solution；(2) perlite powder after being ground up, sieved is added in Fe-base Solution, and sealing stirring obtains iron and carries perlite mixed serum；(3) sodium hydroxide solution is carried perlite mixed serum with iron to mix, sealing stirring, drying obtains iron-based powder；(4) chloroacetic acid is soluble in water with NaHS, sealing stirring obtains outer anion of mixing and captures solvent；(5) outer anion of mixing is added in iron-based powder to capture in solvent, sealing stirring, drying obtains the modified iron-based mercury absorbent in surface.Iron-based mercury absorbent preparation method of the invention is simple, preparation process strong operability；The capture effect that effective distribution of the adsorbent in acid or alkaline waste liquor improves sulfydryl to mercury may be implemented, the delay effect to mercury contaminants can also be strengthened.
Description
Technical field
The present invention relates to a kind of preparation sides of the modified iron-based mercury absorbent of the preparation method of mercury absorbent more particularly to surface
Method.
Background technique
Mercury pollution waste liquid is mainly derived from coal fired power generation, battery production and recycling disposal, non-ferrous metal, carbide production
PVC industry etc..Usual mercury pollution waste liquid can be divided into peracidity waste water, general mercury-containing waste water and laboratory mercury-containing waste water three classes.It is high
Acid mercurous waste liquid occurs mainly with the relevant industries such as coal fired power generation and non-ferrous metal metallurgy, have yield it is big, with batch waste liquid
The features such as mercury fluctuation of concentration is larger in mercury content height, different batches waste liquid.And general mercury-containing waste water is mainly raw by regeneration mercury, PVC
The industries such as production, battery generate, and have the characteristics that mercury content range is larger.
It is directed to the disposition of mercurous waste liquid, main applied chemistry precipitating and two kinds of technologies of absorption at present.For chemical precipitation side
Method there are chemical reagent consumption height, is separated by solid-liquid separation difficult, easily raw secondary pollution problems.Relative to chemical precipitation method, mercury absorption
Technical operation is more simple, and disposal process controllability is strong, and adsorbent easily recycles, and repairing efficiency is short, but there is also suctions for adsorption technology
The problems such as attached effect is limited, sorbent life is short, high-efficiency adsorbent synthesis technology is complicated.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes that a kind of simple process, the surface modification of strong operability are iron-based
The efficient absorption to mercury in acid or alkaline waste liquor may be implemented in the preparation method of mercury absorbent, adsorbent.
Technical solution: the preparation method of the modified iron-based mercury absorbent in surface of the present invention, comprising the following steps:
(1) ferrous sulfate is soluble in water with ferric sulfate, sealing stirring obtains Fe-base Solution；
(2) perlite powder after being ground up, sieved is added in Fe-base Solution, and sealing stirring obtains iron and carries perlite
Mixed serum；Wherein, the perlite powder specific surface after being ground up, sieved is big, and ferrous ion and ferric ion can have
The load of effect ground is on perlite powder granule surface activity site；
(3) sodium hydroxide solution is carried perlite mixed serum with iron to mix, sealing stirring, centrifugation, filtering, vacuum condition
Lower drying obtains iron-based powder, and resulting iron-based powder lightweight is bulk；
(4) chloroacetic acid is soluble in water with NaHS, sealing stirring obtains outer anion of mixing and captures solvent；
(5) outer anion of mixing is added in iron-based powder to capture in solvent, sealing stirring, is dried under centrifugation, filtering, vacuum condition
It is dry, obtain the modified iron-based mercury absorbent in surface.
Wherein, the molar ratio of ferrous iron Fe (II) and ferric iron Fe (III) are 1.4~4.6:1 in the step (1), excellent
It is selected as 2~4:1.
The solid-to-liquid ratio of perlite powder and Fe-base Solution is 1:1~2 in the step (2).
OH in the step (3)-Molar ratio with Fe (II) is 1~3.0:1, preferably 1.5~2.5:1.
Molar ratio 1:0.5~2.5:2.5~4.5 of chloroacetic acid, NaHS Fe (II) in the step (4), preferably
For 1:1~2:3~4.
Iron-based powder and the solid-to-liquid ratio for mixing anion capture solvent outside are 1:0.75~1.5 in the step (5).
Expanded perlite in the step (2) after grinding crosses 100~400 meshes.
Perlite powder specific surface used in the present invention is big, and ferrous ion and ferric ion pass through Electrostatic Absorption
Effect can be loaded effectively on perlite powder granule surface activity site.Iron carries perlite mixed serum and hydrogen-oxygen
After change soda lye is mixed, generates sulfate anion and mix the double-deck shape patina ferrite based substances.Since there are both sexes hydroxyls on its surface
Base, patina can not only adsorb inorganic or organic anion and metal cation can also be with Adsorption organic acid.The adsorption machine of patina
Reason specifically includes that anion exchange, ligand exchange, surface complex reaction.When chloroacetic acid and NaHS contact, sulphur occurs
Sodium hydride alkylation reaction (CH2ClCOOH+NaSH→SHCH2COOH+NaCl), thioacetic acid is generated.When the bulk iron-based powder of lightweight
With when mixing anion capture solvent outside and mix, thioacetic acid and NaHS are adsorbed in patina ferrite based substances surface, and realization is to green
The sulfydryl modification of rust material surface.When the modified iron-based mercury absorbent in the bulk surface of lightweight is put in mercurous waste liquid,
It can be more evenly distributed in liquid phase by hydrogen bond action, while be realized by sulfydryl capture effect to mercury pollution in waste liquid
The quick removal of object.Be attracted to the modified iron-based mercury absorbent surface in the bulk surface of lightweight mercury ion can in electrostatic force and
It is further migrated, and is finally trapped in green to absorbent particles kernel direction by ionic transport passages under ion exchange
Between rusty scale.
The utility model has the advantages that compared with prior art, iron-based mercury absorbent preparation method of the invention is simple, and preparation process can grasp
The property made is strong；It is load substrate with perlite powder, while surface is carried out to the bulk iron-based powder surface of lightweight and dredges base modification,
Both the capture effect that effective distribution of the adsorbent in acid or alkaline waste liquor improves sulfydryl to mercury may be implemented, can also strengthen
The adsorbance of delay effect to mercury contaminants, the modified iron-based mercury absorbent in surface is 682.58~731.59mg/g, and surface
The adsorbance of unmodified iron-based mercury absorbent is only 46.52~62.47mg/g.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment 1
Ferrous iron and ferric iron molar ratio influence the absorption property of iron-based mercury absorbent
As shown in Figure 1, for the preparation process of the iron-based mercury absorbent of the present invention, specifically: suitable expanded perlite is weighed,
It is sieved with 100 mesh sieve after grinding, obtains perlite powder.Be 1.4:1,1.6:1 by ferrous iron and ferric iron molar ratio, 1.8:1,
2:1,2.5:1,3:1,3.5:1,4:1,4.2:1,4.4:1,4.6:1 weigh ferrous sulfate and ferric sulfate respectively, are mixed into water,
It is stirred under air-proof condition, uniform dissolution obtains Fe-base Solution.It is that 1:1g/mL weighs expanded perlite respectively by solid-liquid ratio
Powder and Fe-base Solution stir evenly under air-proof condition, and iron is prepared and carries perlite mixed serum.By hydroxide ion and two
Valence iron molar ratio is that 1.5:1 weighs sodium hydroxide, is mixed into water, stirs under air-proof condition, uniform dissolution obtains aqueous slkali.It will
Iron carries perlite mixed serum and mixes with aqueous slkali, stirs evenly under air-proof condition, is centrifuged, filtering, dries, fits under vacuum condition
Work as grinding, obtains the bulk iron-based powder of lightweight.It is that 1:1:3 weighs a chlorine respectively by chloroacetic acid, NaHS, ferrous iron molar ratio
Acetic acid and NaHS, are mixed into water, stir under air-proof condition, uniform dissolution, obtain outer anion of mixing and capture solvent.By solid
Liquid ratio is that 1:0.75g/mL weighs the bulk iron-based powder of lightweight respectively and mixes anion capture solvent outside, is stirred under air-proof condition
It mixes uniformly, is centrifuged, filter, dried under vacuum condition, it is appropriate to grind, the modified iron-based mercury absorption in the bulk surface of lightweight is prepared
Agent.
The iron-based mercury absorbent of above-mentioned preparation is used for mercury adsorption test test, specifically: weigh the bulk surface of 1g lightweight
Modified iron-based mercury absorbent puts into 1L containing in mercury solution, stirs 30 minutes, filtering, mercurous waste liquid after being disposed.It is mercurous molten
The initial mercury concentration of liquid is 1000mg/L, the initial pH difference 2,5,8 containing mercury solution.According to standard " water quality mercury, arsenic, selenium, bismuth and antimony
Measurement atomic fluorescence method " (HJ 695-2014) measurement solution in solubilised state mercury concentration.Test result is shown in Table 1.
Lightweight is bulk, and surface is modified iron-based mercury absorbent absorption property according to the calculating of formula (1):
Wherein, qeFor the bulk surface of lightweight modified iron-based mercury absorbent adsorbance mg/g, c0And ctRespectively before adsorption experiment
The concentration mg/L, V of the mercury of solubilised state are mercurous liquor capacity L in solution afterwards, and m is the modified iron-based mercury absorbent in the bulk surface of lightweight
Dosage.
1 ferrous iron of table and ferric iron molar ratio influence the absorption property of iron-based mercury absorbent
As seen from Table 1, when ferrous iron and ferric iron molar ratio are lower than 2:1, (in such as table 1, ferrous iron rubs with ferric iron
Unlisted more low ratio in your ratio=1.8:1,1.6:1,1.4:1 and table 1), since ferrous iron is reduced in preparation process,
The patina ferrite based substances that perlite powder particle surface generates are reduced, then generate more ferromagnets and bloodstone, drop
The activity that low sulfydryl capture mercury ion is further migrated to absorbent particles kernel direction by ionic transport passages, to lead
Cause the significant decrease of the modified iron-based mercury absorbent absorption property in the bulk surface of lightweight.When ferrous iron and ferric iron molar ratio are lower than 2
When~4:1, a large amount of patina ferrite based substances are generated in perlite powder particle surface, are conducive to that mercury ion is induced to be detained
It is final to realize that the modified iron-based mercury absorbent adsorbance in the bulk surface of lightweight is all larger than under the conditions of pH is 2,5,8 in patina interlayer
600mg/g.When ferrous iron and ferric iron molar ratio are higher than 4:1 (in such as table 1, ferrous iron and ferric iron molar ratio=4.2:1,
Unlisted more ratios in 4.4:1,4.6:1 and table 1), since ferrous iron is excessive in preparation process, in swelling perlite powder
The iron-based two layers of hydrate structures of the patina that last particle surface generates collapse, and hinder the out-phase absorption of mercury ion, while also dropping
Low hold-up of the mercury ion in patina interlayer is eventually led under the modified iron-based mercury absorbent absorption property in the bulk surface of lightweight
Drop.
Embodiment 2
Hydroxide ion and ferrous iron molar ratio influence the absorption property of iron-based mercury absorbent
The preparation of iron-based mercury absorbent: weighing suitable expanded perlite, and 250 meshes are crossed after grinding, obtain expanded pearlite
Rock powder end.It is 4:1 by ferrous iron and ferric iron molar ratio, weighs ferrous sulfate and ferric sulfate respectively, be mixed into water, air-proof condition
Lower stirring, uniform dissolution obtain Fe-base Solution.It is that 1:1.5g/mL weighs perlite powder and iron respectively by solid-liquid ratio
Based sols stir evenly under air-proof condition, obtain iron and carry perlite mixed serum.It is by hydroxide ion and ferrous iron molar ratio
1:1,1.2,1.4:1,1.5:1,2:1,2.5:1,2.6:1,2.8:1,3.0:1 weigh sodium hydroxide respectively, are mixed into water, sealing
Under the conditions of stir, uniform dissolution obtains aqueous slkali.Iron is carried perlite mixed serum to mix with aqueous slkali, is stirred under air-proof condition
It mixes uniformly, is centrifuged, filter, dried under vacuum condition, it is appropriate to grind, obtain the bulk iron-based powder of lightweight.By chloroacetic acid, sulphur hydrogen
Change sodium, ferrous iron molar ratio and weigh chloroacetic acid and NaHS respectively for 1:1.5:3.5, is mixed into water, is stirred under air-proof condition
It mixes, uniform dissolution, obtains outer anion of mixing and capture solvent.It is that 1:1 (g/mL) weighs the bulk iron of lightweight respectively by solid-liquid ratio
Based powders and outer anion of mixing capture solvent, stir evenly, are centrifuged under air-proof condition, filtering, dry under vacuum condition, suitably grind
Mill obtains the modified iron-based mercury absorbent in the bulk surface of lightweight.
Mercury adsorption test is tested with embodiment 1, and test result is shown in Table 2.
2 hydroxide ion of table and ferrous iron molar ratio influence the absorption property of iron-based mercury absorbent
As seen from Table 2, when hydroxide ion and ferrous iron molar ratio are lower than 1.5:1 (in such as table 2, hydroxide ion
With more low ratio unlisted in ferrous iron molar ratio=1.4:1,1.2:1,1:1 and table 2), hydroxide ion content is reduced,
So that the double-deck shape patina ferrite based substances and sulfydryl that generate on perlite powder can carry, active site is less, leads to mercury
Quantity of the catch and mercury are reduced in the hold-up of patina interlayer.When hydroxide ion and ferrous iron molar ratio are equal to 1.5~2.5:1,
A large amount of patina ferrite based substances are generated in perlite powder particle surface, are conducive to dredge base load, to be conducive to mercury
The capture of ion out-phase, induction mercury ion are trapped in patina interlayer, final to realize that the modified iron-based mercury absorbent in the bulk surface of lightweight is inhaled
Attached amount is all larger than 640mg/g under the conditions of pH is equal to 2,5,8.(such as when hydroxide ion and ferrous iron molar ratio are lower than 2.5:1
In table 2, unlisted more ratios in hydroxide ion and ferrous iron molar ratio=2.6:1,2.8:1,3.0:1 and table 2),
Since the sodium ion introduced in preparation process increases, the modified iron-based mercury absorbent surface electronegativity in the bulk surface of lightweight is reduced,
To weaken the out-phase absorption of mercury ion, mercury ion is reduced in the hold-up of patina interlayer.
Embodiment 3
Chloroacetic acid, NaHS, ferrous iron molar ratio influence the absorption property of iron-based mercury absorbent
Iron-based mercury absorbent preparation: suitable expanded perlite is weighed, 400 meshes are crossed after grinding, obtain expanded perlite
Powder.It is 4:1 by ferrous iron and ferric iron molar ratio, weighs ferrous sulfate and ferric sulfate respectively, be mixed into water, under air-proof condition
Stirring, uniform dissolution obtain Fe-base Solution.By solid-liquid ratio be 1:2g/mL weigh respectively perlite powder with it is iron-based
Solution stirs evenly under air-proof condition, obtains iron and carries perlite mixed serum.It is by hydroxide ion and ferrous iron molar ratio
2.5:1 weighs sodium hydroxide, is mixed into water, stirs under air-proof condition, and uniform dissolution obtains aqueous slkali.Iron load perlite is mixed
It closes slurries to mix with aqueous slkali, be stirred evenly under air-proof condition, is centrifuged, filtered, dried under vacuum condition, it is appropriate to grind, it obtains
Lightweight is bulk iron-based powder.It is 1:0.5:2.5,1:0.7:2.7,1:0.9 by chloroacetic acid, NaHS, ferrous iron molar ratio:
2.9、1:1:3、1:1:3.5、1:1:4、1:1.5:3、1:1.5:3.5、1:1.5:4、1:2:3、1:2:3.5、1:2:4、1:2.1:
4.1,1:2.3:4.3,1:2.5:4.5 weigh chloroacetic acid and NaHS respectively, are mixed into water, stir under air-proof condition,
Even dissolution obtains outer anion of mixing and captures solvent.It is that 1:1.5g/mL weighs the bulk iron-based powder of lightweight respectively by solid-liquid ratio
Solvent is captured with anion is mixed outside, stirs evenly, is centrifuged under air-proof condition, filter, dried under vacuum condition, it is appropriate to grind, it obtains
To the modified iron-based mercury absorbent in the bulk surface of lightweight.
Mercury adsorption test is tested with embodiment 1, and test result is shown in Table 3.
3 chloroacetic acid of table, NaHS, ferrous iron molar ratio influence the absorption property of iron-based mercury absorbent
As seen from Table 3, when chloroacetic acid, NaHS, ferrous iron molar ratio be lower than 1:1:3 when (in such as table 3, a chlorine
In acetic acid, NaHS, ferrous iron molar ratio=1:0.9:2.9,1:0.7:2.7,1:0.5:2.5 and table 3 it is unlisted more
Low ratio), since NaHS in preparation process and divalent iron content are less, patina ferrite based substances production quantity is reduced, while sulphur
Sodium hydride alkylation reaction is insufficient, and Thioglycolic acid and NaHS suction are insufficient to the sulfydryl modification of patina material surface, finally
The quantity of the catch and mercury for leading to mercury are reduced in the hold-up of patina interlayer.When chloroacetic acid, NaHS, ferrous iron molar ratio are equal to
When 1:1~2:3~4, a large amount of patina ferrite based substances are generated in perlite powder particle surface, base load is dredged sufficiently, has
Conducive to the capture of mercury ion out-phase, induction mercury ion is trapped in patina interlayer, final to realize that the modified iron-based mercury in the bulk surface of lightweight is inhaled
Attached dose of adsorbance is all larger than 660mg/g under the conditions of pH is equal to 2,5,8.When chloroacetic acid, NaHS, ferrous iron molar ratio are high
When 1:2:4 (in such as table 3, chloroacetic acid, NaHS, ferrous iron molar ratio=1:2.1:4.1,1:2.3:4.3,1:2.5:
4.5 and table 3 in unlisted more ratios), NaHS and divalent Fe supply promote mercuric sulphide precipitating to generate.And in short-term
The interior mercuric sulphide covering patina ferrite based substances surface quickly generated causes its activity to reduce, and dredges the reduction of base activity current potential, thus
The out-phase absorption for weakening mercury ion, reduces mercury ion in the hold-up of patina interlayer, is finally degrading the bulk surface of lightweight
The absorption property of modified iron-based mercury absorbent.
Comparative example
By the modified iron-based mercury absorbent in surface of the present invention and surface unmodified iron-based mercury absorbent to mercury adsorb situation into
Row compares
Surface unmodified iron-based mercury absorbent preparation: suitable expanded perlite is weighed, 400 meshes are crossed after grinding, are obtained
To perlite powder.It is 4:1 by ferrous iron and ferric iron molar ratio, weighs ferrous sulfate and ferric sulfate respectively, be mixed into water
In, it is stirred under air-proof condition, uniform dissolution obtains Fe-base Solution.It is that 1:2g/mL weighs expanded pearlite respectively by solid-liquid ratio
Rock powder end and Fe-base Solution, stir evenly under air-proof condition, obtain iron and carry perlite mixed serum.By hydroxide ion and divalent
Iron molar ratio is that 2.5:1 weighs sodium hydroxide, is mixed into water, stirs under air-proof condition, uniform dissolution obtains aqueous slkali.By iron
It carries perlite mixed serum to mix with aqueous slkali, be stirred evenly under air-proof condition, is centrifuged, filtered, dried under vacuum condition, suitably
Grinding, obtains the bulk iron-based powder of lightweight.
The modified iron-based mercury absorbent preparation in surface: suitable expanded perlite is weighed, 400 meshes are crossed after grinding, are obtained
Perlite powder.It is 4:1 by ferrous iron and ferric iron molar ratio, weighs ferrous sulfate and ferric sulfate respectively, be mixed into water,
It is stirred under air-proof condition, uniform dissolution obtains Fe-base Solution.It is that 1:2g/mL weighs expanded perlite respectively by solid-liquid ratio
Powder and Fe-base Solution stir evenly under air-proof condition, obtain iron and carry perlite mixed serum.By hydroxide ion and ferrous iron
Molar ratio is that 2.5:1 weighs sodium hydroxide, is mixed into water, stirs under air-proof condition, uniform dissolution obtains aqueous slkali.Iron is carried
Perlite mixed serum is mixed with aqueous slkali, is stirred evenly under air-proof condition, is centrifuged, filtering, is dried under vacuum condition, is suitably ground
Mill, obtains the bulk iron-based powder of lightweight.It is that 1:2:4 weighs a chloroethene respectively by chloroacetic acid, NaHS, ferrous iron molar ratio
Acid and NaHS, are mixed into water, stir under air-proof condition, uniform dissolution, obtain outer anion of mixing and capture solvent.By solid liquid
Body ratio is that 1:1.5g/mL weighs the bulk iron-based powder of lightweight respectively and mixes anion capture solvent outside, is stirred under air-proof condition equal
It is even, it is centrifuged, filtering, is dried under vacuum condition, it is appropriate to grind, obtain the modified iron-based mercury absorbent in the bulk surface of lightweight.
Mercury adsorption test is tested with embodiment 1, and test result is shown in Table 4.
The modified iron-based mercury absorbent in 4 surface of table and surface unmodified iron-based mercury absorbent are to mercury adsorbance
As shown in Table 4, under the conditions of pH is equal to 2,5,8, the modified iron-based mercury absorbent in surface is much larger than mercury adsorbance
Surface unmodified iron-based mercury absorbent carries out surface to the bulk iron-based powder surface of lightweight and dredges base modification to mercury adsorbance, can
To strengthen the suction-operated to mercury contaminants.
Claims (10)
1. a kind of preparation method of the modified iron-based mercury absorbent in surface, which comprises the following steps:
(1) ferrous sulfate is soluble in water with ferric sulfate, sealing stirring obtains Fe-base Solution；
(2) perlite powder after being ground up, sieved is added in Fe-base Solution, sealing stirring, obtains iron and carries perlite mixing
Slurries；
(3) sodium hydroxide solution is carried perlite mixed serum with iron to mix, sealing stirring, drying obtains iron-based powder；
(4) chloroacetic acid is soluble in water with NaHS, sealing stirring obtains outer anion of mixing and captures solvent；
(5) outer anion of mixing is added in iron-based powder to capture in solvent, sealing stirring, drying, obtains the modified iron-based mercury suction in surface
Attached dose.
2. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(1) molar ratio of Fe (II) and Fe (III) are 1.4~4.6:1 in.
3. the preparation method of the modified iron-based mercury absorbent in surface according to claim 2, which is characterized in that the step
(1) molar ratio of Fe (II) and Fe (III) are 2~4:1 in.
4. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(2) solid-to-liquid ratio of perlite powder and Fe-base Solution is 1:1~2 in.
5. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(3) OH in-Molar ratio with Fe (II) is 1~3.0:1.
6. the preparation method of the modified iron-based mercury absorbent in surface according to claim 5, which is characterized in that the step
(3) OH in-Molar ratio with Fe (II) is 1.5~2.5:1.
7. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(4) molar ratio of chloroacetic acid, NaHS and Fe (II) is 1:0.5~2.5:2.5~4.5 in.
8. the preparation method of the modified iron-based mercury absorbent in surface according to claim 7, which is characterized in that the step
(4) molar ratio of chloroacetic acid, NaHS and Fe (II) is 1:1~2:3~4 in.
9. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(5) iron-based powder and the solid-to-liquid ratio for mixing anion capture solvent outside are 1:0.75~1.5 in.
10. the preparation method of the modified iron-based mercury absorbent in surface according to claim 1, which is characterized in that the step
(2) expanded perlite in after grinding crosses 100~400 meshes.
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